I bought a compensator/barrel bushing for my Colt mk 4/mod 70, installed it late last week, and took it to the range this morning. Took several of my other full frame .45's to compare: my other government Colt, an old S&W, my M&P, and my Glock.
For my full frame .45's, my M&P and Glock shoots the best, but compared to the compensated Colt, the improvement in the control of the kick-back meant that I was able to get back on target for the double tap with much better accuracy. So I figure the modified Colt now has better control now with the double-tap and rapid fire.
After an hour and a half and 300 rounds, I was done. Payed my bill, and wandered around looking at all the guns they had for sale.

Saw a new FN FNX Tactical .45 with a threaded 6" barrel, and 3 10 count mags for $1050!
That's cheap, considering the MSRP is about $1400
Got the permit, and have transferred the money, it's gonna be mine!

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"Why do you hate private business decisions?" -Inevitable-
"She's got every right to speak her mind and make decisions about her business, but all hell breaks loose if someone refuses to bake a cake for a gay couple." -CrapFactory-

Took me 3 months, but I finally got the FNX to the range today.
Put 200 rounds of 165 gr. FMJ's through it, and did real good.
It better for the price I paid for it!

Excellent balance, not a lot of kick compared to my other .45s, that helped coming back on target and for an accurate double-tap. Grouping was tight making me look like I new what I was doing.
The sights I could actually see too. Some of my pistols don't have the iridescent dots on them. I got the paints, I should take the time and put it on them.